61651 has 2 divisors, whose sum is σ = 61652. Its totient is φ = 61650.

The previous prime is 61643. The next prime is 61657. The reversal of 61651 is 15616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61651 - 2³ = 61643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825 + 30826.

It is an arithmetic number, because the mean of its divisors is an integer number (30826).

2⁶¹⁶⁵¹ is an apocalyptic number.

61651 is a deficient number, since it is larger than the sum of its proper divisors (1).

61651 is an equidigital number, since it uses as much as digits as its factorization.

61651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 19.

The square root of 61651 is about 248.2961940908. The cubic root of 61651 is about 39.5045126501.

The spelling of 61651 in words is "sixty-one thousand, six hundred fifty-one".